Bending-machine.



PATENTBD DEG. 8,-1903.

J. H. BAKER. BENDING MACHINE. APPLICATION FILED urns, 1903.

3 SHEETS-SHEET 1.

H0 MODEL.

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PATENTED DEC. 8, 1903.

J. H. BAKER'. BENDING MACHINE.

APPLICATION FILED JAN. 5, 1903.

3*SHEETS-SHEET 2.

NO- MODEL.

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' UNITED STATES Patented December 8, 1903.

PATENT OFFICE. r f

JAMES H. BAKERpOF ALLEGHENY, PENNSYLVANIA, ASSIGNOR TO JAS. H. BAKER MANUFACTURING GOMP'ANY,"OF PITTSBURG, PENNSYLVANIA,

A CORPORATION OF PENNSYLVANIA.

BENDINQ -MAC l- IINE- SPECIFICATION forming part of Letters Patent No. 746,263,;1ated December 8, 1903. Application filed January 5. 1903. SerialNo. 137.869. (No model.)

" Bending-Machines, of which improvements the following is aspecification. The invention described herein relates to certain improvements in mechanism forbending iron or steel bars, 850., and has for its bject a construction and combination of inc chanical elements whereby blanks regular and irregular in cross-section may be bent to the desired shape.

The invention is hereinaftermore fully described and claimed. p

In the accompanying drawings, forming a I part of this specification, Figure 1 isa top plan View of my improved bending mechanism. Fig. 2 is a side elevation of the same. Fig. 3 is a plan view,on an enlarged scale, of the parts directly operative on theblank to be bent. Fig. 4 is a sectional elevation on a plane indicated by the line [V IV, Fig. 1. Figs. 5, 6, 7, and 8 are detail views of the-bending-jaws and the die-holding cups.

In the practice of my invention a cross-head 1 is mounted on suitable guideways on the frame or bed 2 and is reciprocated by the power-shaft 3 through the medium of pins 4., secured eccentrical'ly on disks 5 on the shaft and connected by pitmen 6 to the cross-head.

This cross-head is connected by links 7 to swinging heads 8, which are provided at their inner ends with ears 9 and 10, pivotally con nected to the upper and lower arms 11 and 12 of the sliding block 13. This block, which is mounted in suitable guideways in the frame or bed 2, is drawn back from operative position by the cross-head operating through the links 7 and heads 8, while the forward move.

ment of the block into contact with the article to be bent is effected by an eccentric 14 with a gripping or holding head 16, adapted to press the blank against the former around which said blank is to be bent. This holding or grippinghead is provided with a bearing portion 16, pivotally connected to the head, so that it will accommodate itself to the blank in case the latter is not properly placed or there is some lateral movement of the block 13. The former is made in two parts or sections 17 and 18, one part or section being se-' cured to the frame or bed 2, while the other section is securedto a lever 19, pivotally mounted on the bed or frame. While any suitable means may be employed to shift the lever for the separation of the parts or sections of the former, it is preferred to weight the outer end of the lever to effect the opening movement, while the closing movement is 'elfected by a movable prop 20. This prop is made adjustable as regards length by a threaded extension 21, fitting in a threaded socket in the prop. The movement of the prop to close the sections and to permit of their separation, as described, is effected by the push-rod 15, which is connected with the prop by an arm 22 and a pitman 23, as shown in Fig. 2.

Asshown-in Fig. 2, the-parts or sections 17 and 18 of the former are detachably connected to the bed 2 and lever 19, so that different formers, corresponding to the shapes of the articles to be produced, can be used. Similarly the dies 24 are removably secured'in the swinging heads 8.

A desirable construction consists in forming recesses 25 in the heads for the reception of the boxes 26, which are held in place by the caps 27, secured to the heads by suitable bolts. It is preferred .tomake the recesses 25 in the heads larger than the boxes and to arrange fillers 28 between the sides of the By the boxes and the walls of the recesses. employment of fillers of varying thicknesses the position of the die-holding boxes in the recesses can be changed as required by the work to be done. The dies 24 are connected to the boxes by pivot-pins 29, permitting some swinging movement of the dies'to accommodate themselves to the surfaces of the too A In bending a blank it is placed in position in front of the former, as shown in Fig. 3. As the shaft is revolved the cross-head 1 and push rod 15 are caused to move forward, thereby simultaneously shifting both the block 13 and swinging heads 8. By reason of the relative arrangement of the holding or gripping head and the swinging heads the holding-head 16 will firmly clamp the blank against the former before the swinging heads come into operation. The eccentric is so shaped that after the blank has been gripped there will not be any further onward movement of the push-rod 15. As the cross-head 1 continues its forward movement the heads 8 are swung around toward the former, and the block 13 is also moved forward, so that the gripping-head 1.6 may hold the blank firmly against the former during the bending operation. In order to prevent the gripping head from being forced too hard against the blank, a stop-plate 32 of a thickness dependent on the width of the blank. is inserted at the end of the gnideway for the block 13 to limit the forward movement of the block, as shown in Fig. 2.

The sections 17 and 18 of the former are closed firmly together by the push-rod 15 as it shifts the block 13, operating through the medium of the pitman 23 and prop 20.

I claim herein as my invention 1. A bending'machine having in combination a former, a movable block provided with a gripping or holding head, swinging heads pivotally connected to the block, and means for moving the block toward the former and means independent of the former for causing the heads to move with the block.

2. A bending-machine having in combination a former, a movable block provided with a gripping or holding head, swinging heads pivotally connected to the block, means for moving the block and heads toward the former moving the block toward the former, swinging heads pivotally connected to the block, a reciprocating cross-head and connections from the cross-head to the swinging heads, substantially as set forth.

5. A bending-machine having in combination, a sectional former, a lever carrying one of said sections, a movable block provided with a gripping or holding head, swinging heads pivotally connected to the block and means for moving the block and heads toward the former and for closing the sections of the former, substantially as set forth.

6. A bending-machine having in combination therewith, swinging heads having recesses therein, boxes arranged in said receses and dies pivotally mounted in the boxes, substantially as set forth.

7. A bending-machine having in combination therewith, swinging heads having recesestherein. boxes arranged in said recesses, means for adjusting the boxes and dies pivotally mounted in the boxes, substantially as set forth.

In testimony whereof I have hereunto set my hand.

JAMES H. BAKER.

Witnesses:

DARWIN S. WoLcoTT, F. E. GAITHER. 

